If someone were to ask you how to tell if something’s leaking, you might be tempted to smirk a bit: “Umm, well, there’s water where there shouldn’t be water.” Duh. In many cases, your smirk would be justified. Leaks are pretty obvious when there’s a puddle on the floor or in a cabinet. But sometimes, you might find just the evidence of a leak, like the water ring on the ceiling that lines up perfectly with the toilet in the kids’ bathroom. And let’s not forget about the non-visual clues, like that musty smell in your laundry room.